Jenny McCarthy is enjoying the single life. The former Playmate, who has a new book out called “Bad Habits,” hosted 2(x)ist underwear’s fashion show at Arena Thursday flanked by barely-clothed male models. McCarthy then headed to 1Oak, where a source says, “She was the life of the party. “Jenny was out with her manager but looked like she was having a great time dancing and talking to people near her table.” McCarthy split with the Chicago Bears’ Brian Urlacher in August.